Five potential Facebook killers

And three sites crushed by Facebook that are hoping for a re-birth
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The social networking scene is constantly in flux. Facebook is at the top of the heap right now,  but challengers are springing up all the time, hoping to leverage the next big wave into a lucrative IPO. Here are five social media sites that are creating a buzz.

5 hot social networking sites

Where IT pros do their social networking

20 most useful social networking sites

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